refactor: login by email (loginId kept as internal identifier)

backend/src/main/java/com/srsystem/config/jwt/CurrentUserArgumentResolver.java

@@ -34,11 +34,11 @@ public class CurrentUserArgumentResolver implements HandlerMethodArgumentResolve
             log.warn("No authentication found");
             return null;
         }
-        String loginId = authentication.getName();
-        log.info("Resolving current user for loginId: {}", loginId);
-        Employee emp = authService.getEmployeeByLoginId(loginId);
+        String email = authentication.getName();
+        log.info("Resolving current user for email: {}", email);
+        Employee emp = authService.getEmployeeByLoginId(email);
         if (emp == null) {
-            log.warn("Employee not found for loginId: {}", loginId);
+            log.warn("Employee not found for email: {}", email);
             return null;
         }
         log.info("Found employee: empId={}, name={}", emp.getEmpId(), emp.getName());

backend/src/main/java/com/srsystem/dto/LoginRequest.java

@@ -5,8 +5,8 @@ import com.srsystem.entity.enums.RoleCode;
 import jakarta.validation.constraints.NotBlank;
 
 public record LoginRequest(
-        @NotBlank(message = "로그인 ID 는 필수입니다")
-        String loginId,
+        @NotBlank(message = "이메일은 필수입니다")
+        String email,
         @NotBlank(message = "비밀번호는 필수입니다")
         String password
 ) {

backend/src/main/java/com/srsystem/repository/EmployeeRepository.java

@@ -16,6 +16,7 @@ import java.util.Optional;
 public interface EmployeeRepository extends JpaRepository<Employee, Long> {
     @Query("SELECT e FROM Employee e WHERE e.loginId = :loginId")
     Optional<Employee> findByLoginId(@Param("loginId") String loginId);
+    Optional<Employee> findByEmail(String email);
     List<Employee> findByNameContainingIgnoreCase(String name);
     Page<Employee> findByEmpStatus(EmpStatus status, Pageable pageable);
 }

backend/src/main/java/com/srsystem/service/AuthService.java

@@ -27,15 +27,15 @@ public class AuthService {
 
     @Transactional
     public LoginResponse login(LoginRequest request) {
-        Employee employee = employeeRepository.findByLoginId(request.loginId())
+        Employee employee = employeeRepository.findByEmail(request.email())
                 .orElseThrow(() -> new BusinessException(ErrorCode.INVALID_CREDENTIALS));
 
         if (!passwordEncoder.matches(request.password(), employee.getPassword())) {
             throw new BusinessException(ErrorCode.INVALID_CREDENTIALS);
         }
 
-        String accessToken = jwtTokenProvider.generateAccessToken(employee.getLoginId(), employee.getRoleCode().name());
-        String refreshToken = jwtTokenProvider.generateRefreshToken(employee.getLoginId());
+        String accessToken = jwtTokenProvider.generateAccessToken(employee.getEmail(), employee.getRoleCode().name());
+        String refreshToken = jwtTokenProvider.generateRefreshToken(employee.getEmail());
 
         EmployeeSummary summary = employeeService.toSummary(employee);
 
@@ -48,12 +48,12 @@ public class AuthService {
             throw new BusinessException(ErrorCode.INVALID_CREDENTIALS);
         }
 
-        String loginId = jwtTokenProvider.getLoginId(refreshToken);
-        Employee employee = employeeRepository.findByLoginId(loginId)
+        String email = jwtTokenProvider.getLoginId(refreshToken);
+        Employee employee = employeeRepository.findByEmail(email)
                 .orElseThrow(() -> new BusinessException(ErrorCode.EMPLOYEE_NOT_FOUND));
 
-        String newAccessToken = jwtTokenProvider.generateAccessToken(employee.getLoginId(), employee.getRoleCode().name());
-        String newRefreshToken = jwtTokenProvider.generateRefreshToken(employee.getLoginId());
+        String newAccessToken = jwtTokenProvider.generateAccessToken(employee.getEmail(), employee.getRoleCode().name());
+        String newRefreshToken = jwtTokenProvider.generateRefreshToken(employee.getEmail());
 
         EmployeeSummary summary = employeeService.toSummary(employee);
 
@@ -61,8 +61,8 @@ public class AuthService {
     }
 
     @Transactional(readOnly = true)
-    public Employee getEmployeeByLoginId(String loginId) {
-        return employeeRepository.findByLoginId(loginId)
+    public Employee getEmployeeByLoginId(String email) {
+        return employeeRepository.findByEmail(email)
                 .orElseThrow(() -> new BusinessException(ErrorCode.EMPLOYEE_NOT_FOUND));
     }
 }

backend/src/main/java/com/srsystem/service/EmployeeService.java

@@ -76,10 +76,9 @@ public class EmployeeService {
 
     @Transactional
     public Employee create(Employee employee) {
-        if (employeeRepository.findByLoginId(employee.getLoginId()).isPresent()) {
+        if (employee.getEmail() != null && employeeRepository.findByEmail(employee.getEmail()).isPresent()) {
             throw new BusinessException(ErrorCode.DUPLICATE_LOGIN_ID);
         }
-
         if (employee.getRoleCode() == null) employee.setRoleCode(RoleCode.EMPLOYEE);
         if (employee.getEmpStatus() == null) employee.setEmpStatus(EmpStatus.ACTIVE);
         if (employee.getDispatchStatus() == null) employee.setDispatchStatus(DispatchStatus.WAITING);